.bmi-box {
    max-width: 500px;
    margin: auto;
    margin-top: 50px;
    padding: 30px;
    border-radius: 15px;
    background: white;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
  }
  .result-box {
    background: #eaf6ff;
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
  }
  .btn-custom {
    background-color: #28a745;
    color: #fff;
  }